Telephone paging system and method

ABSTRACT

A telephone system and radio paging transmitters are combined by using dialed assigned telephone numbers to cause an information storage device to indicate radio paging areas corresponding to the dialed assigned number and, through the telephone system, to cause actuation of radio paging transmitters serving the radio paging areas to transmit a predetermined radio signal associated with the dialed assigned number. In some cases this will include a first information storage device, connecting itself to other information storage devices in order to achieve the connection to all the radio paging areas involved. Voice communication may also be provided for between the dialling party and the bearer of a radio paging receiver corresponding to an actuated paging transmitter.

United States Patent [72] lnventors Derek Leybul'n St. Laurent, Quebec;David Johnston Horton, Baie Durf, Quebec; Edward G. F. Baker,Roxborough, Quebec; Claude Lemieux, St. Bruno, Quebec, Canada [21 Appl.No. 754,522 [22] Filed July 26, 1968 [45] Patented Apr. 20, 1971 [73]Assignee Bell Canada Montreal, Quebec, Canada [32] Priority July 4, 1968[33] Canada [31 1 024,220

[54] TELEPHONE PAGING SYSTEM AND METHOD 7 Claims, 4 Drawing Figs. [52]US. Cl 179/41, 325/55 [51] Int. Cl. H04q 7/00 [50] Field of Search340/311,

312; 179/2 (RS),41 (A), 18.04; 325/64,55

References Cited UNITED STATES PATENTS 2,259,316 10/1941 Lyle 325/642,985,719 5/1961 Becker 179/18 3,041,402 6/1962 Dimmer 179/41 PrimaryExaminer-Kathleen H. Claffy Assistant Examiner-Douglas W. OlmsAttorney-Westell and Hanley ing areas involved. Voice communication mayalso be pro- 1 vided for between the dialling party and the bearer of aradio paging receiver corresponding to an actuated paging transmitter.

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SHEET 3 0F 4 J 5 2533 (06 EU e a b. 39 ag V g 15:21 QX Q FIG 5 EDWAQD G.F. BAKER CLAUDE LEMIEJ-IX TFLElPll'lUNE PAGING SYSTEM AND METHOD Thisinvention relates to a telephone paging system wherein a telephonesubscriber is provided, when away from his telephone, with a radio,herein called a paging receiver which he carries on or near his person.The receiver is designed, in cooperation with the associated telephonesystem and a transmitter connected thereto so that when a paging numberis dialled into the system a sensible (usually audible) signal which isintended to inform the subscriber that he is to phone a prearrangedlocation (usually his headquarters or offree) is provided. The pagingreceiver is usually designed so that once energized, it will continue toemit the alann until the subscriber turns it off. Thus the broadcastsignal may be of short duration. it will be appreciated that thetransmitter has a localized area where it may be received and that,within this area, a transmitter signal will be provided corresponding toeach paging subscriber and each paging subscriber has a receiverresponsive only to one of the transmitter signals.

The transmitter-paging receiver connection may be when connected torecognize (or not) a later subset of the set i as identifying (or not) apaging subscriber. if such identificaachieved in any desired mannerwhich allows the transmitter to be controlled to emit a signal whichwill actuate one, and only one, paging receiver, and on the other hand,where the transmitter is controllable to emit as many of such signals asthere are paging subscribers in the area covered by the transmitter. ina preferred vbutwell-known form of signalling, the

transmitter is designed, and controlled, to emit successive preferablydecimal digits represented by tones between 126 Hz. and 2200 Hz.modulated on a 35, I50 or a 450 megahertz carrier. Each pagingreceiveris designed to respond to a unique sequence of such digits to becomeactivated to emit a sensible tone. The paging receiver is designed sothat, once energized, it will emit a sensible (usually audible) alarmuntil turned off by the possessor of the receiver. Thus the trans mittersignal need only be sent once. The number of digits sent by thetransmitter to uniquely energize a reciever will, of course, depend onthe number of receivers in a paging area.

By use of the term dialling, dialled or dial in this application and inthe claims, l refer to the electrical sigrals transmitted through thetelephone system rather than to the manual act and thus l refer notonly, on the one hand, to pulses produced by the conventional telephonedial but also to tones indicative of digits as in the TOUCH-TONE systembut to electrical signals of any kind carried on telephone lines andindicative of telephone number digits, while on the other hand, the termincludes similar signals produced by automatic and] or electricalapparatus (such as an automatic calling unit) without manual initiation.

Present fonns of such paging systems have however suffered from thedisadvantage that each transmitter had a separate telephone number andeach localized area required a separate paging call by the callingparty.

The same telephone number could not be assigned to various areas sincethese would, in accord with the overall telephone system operation,require different numbers. in other words, in the prior art a separatepaging system was required for each city. These separate systems werenot interconnectable as far as a subscriber was concerned and asubscriber was therefore confined to paging service within one cityonly. To page a subscriber in more than one city, a unique telephonenumber was required for each city involved. This would have been timeconsuming and would have resulted in excessive use of the switchingnetwork. Thus the use of a peg ing system was effectively limited tolarge metropolitan areas.

This invention provides a paging system for connection to a conventionaltelephone system wherein subscribers to the paging service are providedwith telephone numbers which may be dialed into the conventional systemfor switching and transmission as any other telephone number. Suchpaging subscribers numbers are herein referred to as paging accessnumbers. A storage center usually a computer is connectable to thetelephone system for connection on the dialling of an earli er subset ofdialled digits of the set consisting of the digits in said paging accessnumber. The storage center is designed tion exists, the storage means isdesigned to provide information in digital form of thetransmitter areaswhere that particular paging subscriber requires service. The storagecenter is associated with means responsive to said information to dialthe number of the transmitters corresponding to areasdesignated by thecalled subscriber, directly associated with the storage center, and toprovide thereto information characteristic of the called subscriber. Thetransmitters are designed (as the present ones are also) to provide onconnection by their dialled number followed by signals characteristic ofthe subscriber to transmit the signal for which the subscribers set istuned. In addition to a plurality of transmitters associated with astorage center (usually representing adjacent parts of a metropolitanarea or adjacent cities etc.) the system envisages transmittersassociated with other storage centers which respectively will have othertelephone systems associated therewith and the system envisages thatsome subscribers will subscribe for paging in areas associated with asecond or other storage centers. A paging call will reach the firststorage center and on receipt of the paging number the storage centerwill'call all its associated transmitters for which the subscriber hasapplied and provide them with information identifying the subscriber;but will also dial through the telephone system to connect itselftherethrough to other storage centers associated with other transmitterareas in which the subscriber has requested paging service. The otherstorage centers, on being called, are provided with a paging accessnumber and by consultation of their records associated with such pagingnumber, will actuate their relevant associated transmitters. The pagingaccess number supplied to a second storage center by the first may notuse the same subscriber identifying digits as the first since all thatis important is that the digits supplied to the second storage centerare such as to cause its transmitters to call the same subscriber'spaging set. Thus, with the novel system, the dialing of the number of asingle paging subscriber will cause, through the use of the telephonesystem, radio transmitted paging numbers to be sent out in any area ofthe system which the subscriber has designated.

The inventive method and apparatus lend themselves to the furtheradvantage that paging calls involving use of the toll switching networkbetween two centers may be delayed for a predetermined period or until apredetermined number for transmission between two centers is collectedor a certain time has elapsed whichever period is shorter and sent allat once with a single use of the toll switching network.

It will be noted that the areas which may be reached through originaldialling of a single paging access number using the methods of theinvention are as extensive as the telephone system and thus within thesystem a subscriber could be provided with paging along commercial air,road, rail and water routes.

in drawings which illustrate a preferred embodiment of the invention:

FIG. 1 shows a block diagram of a system in accord with the invention:

H6. 2 shows a diagram of a trunk circuit shown as a block in FIG. 1;

FIG. 3 shows a diagram of a voice control circuit shown as a block inFIG. 1; and

FIG. 4 shows a diagram of a code converter circuit shown as a block inFIG. 1.

IN HO. 1 is shown a local switching office 10 for handling telephonecalls between subscribers in local calling areas, and the localswitching office may be of any desired conventional form. it will benoted that in accord with the invention local and toll switching officesof different types may be operated by the same storage center which iseasily programmed to send dial signals operable by the switching officeit is calling.

Connected to the local switching office 10 for transmitting longdistance calls thereto and therefrom is a toll switching offree 12.Elements such as the switching offices 10 and 12 are,

of course, part of a conventional telephone system and handle normal aswell as paging telephone calls. The toll switching office also maybe ofany conventional form well known in the telephone switching art. Itshould be noted here that, included with its normal connections tovarious long distance points relative to the local switching officeserved by 19, are connections to adjacent cities or areas A, B and C.

The local switching office and the toll switching office 12 areconnected through a trunk circuit 14 (to be later described) to astorage center comprising computer 16. The local switching office 10 andthe toll switching office 12 are connectable through the trunk circuit14 back to local switching office 10.

The computer 16 may be of any desired form suitable for the storage andretrieval of information. Examples of preferred and available computertypes are the P.D.P.8. manufactured by Computing Devices of CanadaLimited, 59 Richmond Street East, Toronto, Canada, or the Univac 418manufactured by the Univac Division of Sperry Rand of Canada Limited,984 Bay Street, Toronto, Canada. However the functions required of thecomputer in the application are conventional and are available in manycomputers other than those named.

The computer is connected to control an automatic call until 18A anddata set 1138. The automatic call unit portion of the device isdesigned, on request, to place dialling signals on an output telephoneline 20. The data set portion of this device is designed, on request, toplace information on telephone line 20 as supplied by the computer in aform usable by a device connected to the telephone system to which ithas been connected by the dialing of call unit 18A. The automatic callunit 18A and the data set 188 may each be of any of a number of designsavailable to those skilled in the art but it is preferred to use for theautomatic call unitdata auxiliary set 801C,

Data set Data set 40115.

The models for the automatic call unit and the data set specified areboth manufactured by American Telephone and Telegraph Company, 195Broadway, New York, N.Y., 10007.

The trunk circuit 14 also has an output connectable to line 20.

Line 20 fed by the automatic calling unit, and data set 18 andselectively by trunk circuit 14 is connected into the local switchingoffice 10. Thus the line 20 may be connected by the local switchingoffice 10 in accord with numbers dialled by the automatic calling unit18. These numbers in a wide area system will fall into three classes,

a. through the local switching office to a transmitter sociated with thelocal switching office 10,

b. through the local and the toll switching office to a transmitter ortransmitter associated with a local switching office similar to 10 whichis associated with the same computer 16,

c. through the local and the toll switching office to a computer similarto computer 16 having one or more transmitters associated therewith.

However, it will be appreciated that the invention applies to systemswhich have less than all of these alternatives.

Continuing with the specific embodiment those elements associated withclass (a) will now be described.

An output line 24 from the switching office 18 is connected to a dataset 26. This data set 26 has an inverse operation from data set 183which was designed to accept encoded information from computer 16 and toconvert this to a form suitable for transmission through the telephonesystem. The data set 26 is designed to accept signals suitable for thetelephone wires and to convert these signals into a form suitable foruse by a succeeding apparatus. The data set 26 may be embodied in anyfonn suitable and available. However, it is preferred to use for thispurpose data set 401J manufactured by American Telephone and TelegraphCompany whose address has been previously set out.

The output of data set 26 is connected to the code converter 28.Transmitters 30 are controlled in accord with tones supplied by atonegenerator 32 to a transmitter control circuit 34 whose output isconnected to transmitters 30. Preferably a plurality of tones is madeavailable by the tone generator 32 and one or more of such tones areselectively provided to the transmitter control circuit 34 where theselected tones, in accord with techniques well known to those skilled inthe art cause the transmitter control circuit 34 to determined thetransmitter 30 output frequencies. The tone generator 32 makingavailable the necessary selection of tones is connected to thetransmitter control circuit 34 through the code converter circuit 28.The function of code converter 28 is to select the tones for thegenerator 32 to be applied to transmitter control circuit 34. The codeconverter 28 will be hereinafter described. The tone generator 32 may beof any of a number of types well known to those skilled in the art andcompatible in available tones with the transmitter control circuit 34and code converter 28.

Similarly the transmitter 30 and control circuit 34 may be of any knowntype compatible with the tone generator and code converter. Thepreferred tone generator, transmitter and control circuit are embodiedin the Bogen Type B-250-VA4 radio transmitter with power modulation,monitor and trunk terminal panel manufactured by Bogen CommunicationsDivision of Lear Siegler Incorporated, New Jersey U.S.A.

Connectable between the local switching office 10 and transmittercontrol circuit 34 is optionally provided a voice control circuit 36.

Toll switching office 12 is, in this embodiment, connected to a numberof adjacent cities or transmitter areas, here designated cities A, B andC. The arrangement of the system at each of these locations is the sameand connection to city A will only be described.

Circuits similar to circuits previously discussed are assigned numberswith added to their corresponding circuit already discussed.

Toll switching office 12 is connected to toll switching office 112 inthe adjacent city. Toll switching office 112 is connected to localswitching office 110. Local switching ofiice is connected through dataset 126 along line 124 to code converter circuit 128. Code convertercircuit 128 is designed to act in accord with signals received from dataset 126 to select the tones available from a tone generator 132 whichare to be applied to transmitter control circuit 134. A voice controlcircuit 136 is optionally Connectable between local switching office 110and transmitter control circuit 134.

The computer is programmed to store the values of a selected subset ofdigits from the set comprising each paging access number andcharacteristic of such paging access number and to store in associationtherewith information as to the paging areas designed by the subscriberassociated with the paging access number. The computer is programmed toreceive signals representing values which might correspond to the storeddigit value, and on determining whether such correspondence does or doesnot exist to send out a signal as to whether such correspondence existsor not. The computer is programmed, on determining such correspondenceto provide for use in the telephone system, information sufficient tocause connection through the normal telephone system of the computer(local area) or another computer (wide area) to each transmitter for anarea designated by the subscriber, and on achieving said connection thecomputer so connected will provide, along said connection, controlsignals to cause the designated transmitter to broadcast the subscriberspaging signals.

In operation, with the system as shown in FIG. 1 (and noting that threeof the circuits discussed are still to be described in detail) thereceipt of a paging access number from a local calling point at localswitching office 10 or the receipt of a paging access number from aremote calling point at the toll switching ofiice 12, in either eventcauses the office 10 or 12 to seize a trunk circuit 14 and thereby toachieve connection to the computer 1l6. On this being achieved therequired number of digits from the paging access number is supplied tothe computer and the computer determines whether or not there is apaging access number in its store corresponding to the digits receivedand sends a call accepted or a call not accepted signal, in accord withsuch determination, to the calling party.

in either event, unless the calling party desires voice communication,as hereinafter described, he may hang up. If the call is accepted,indicating that the digits received by the computer correspond to a setstored by the computer, then the computer determines the transmitterarea or areas corresponding to the digits, in other words the pagingaccess areas designated by the subscriber whose paging access numbercontains the recognized digits. .1 he computer then causes the automaticcall unit llfiA to dial through the conventional telephone system thetransmitters corresponding to the area designated. With each transmitterdialled, the automatic call unit achieves connection through the localswitching offree along line 26 to the data set 26 or 126 correspondingto the transmitter dialled. Thus the transmitter may be local,corresponding to data set 26 or may be remote in which case theautomatic call unit 16A is instructed by the computer 16 to connectthrough the telephone system through office 110 and 12 to a remote dataset for example data set 126. The automatic call unit may also call acomputer similar to computer 116 for another part of the system, butthis will be described hereafter. Calls to data set 26 are executedimmediately. Calls passing through the toll office may for a givendestination be stored by the computer until a predetermined number arereceived or a certain time elapses (whichever first occurs) and thenforwarded by a single dialling procedure, thus reducing volume of callsthrough the toll switching network. Since the operations associated withdata set 26 and data set 126 are similar, the operation associated withdata set 26, only, will be described.

When connection is achieved by the automatic calling unit 66A to dataset 26 in accord with the well-known and commercially available designthe data set signals the fact back to the computer.

The computer then disconnects the calling unit and connects the data setMB to line and provides signals characteristic of the values of theselected digits from the subscribers number. Data set 26 converts thesignals received into other signals also characteristic of thesubscriber and suitable for the functions of the code converter unit.The code converter unit (to be described) acts as a gate (in accord withthe subscriber characteristic signals it receives from the data set 26)to determine the tone signals supplied to the transmitter control unit34. Thus with the tone signals also characteristic of the subscriber,the transmitter sends out a paging signal to actuate the subscribers setand let him know that he is being paged. Where acknowledgement is to beprovided by the subscriber (an optional feature and a well-knowntechnique prior to this invention) it will be obvious that thesubscriber may transmit back acknowledgement which will be received bythe transmitter and means may conveniently be provided for relaying anacknowledgement signal back into the line 24 for forwarding to thecalling party. Where voice communication is desired, means are providedfor connecting a voice control circuit between local switching officeit) and the transmitter control circuit 1%. As hereinafter described indetail such connection is obtained by the caller maintaining theconnection, after receiving from trunk circuit 114 the call acceptedsignal and the computer s detemiination that voice communication isrequired by such paging access number. With the desire for voiceconnection so indicated:

a. Once the automatic call unit 16A and data set 188 have completedtheir function: computer 16, call unit 18A and data set WE aredisconnected from the trunk circuit, and the trunk circuit M isconnected directly with line 20.

b. After data set 26 has received the paging information from data set168 and relayed it to the code converter, data set 26 is disconnectedfrom line 24 and voice control 36 is connected directly to thetransmitter control circuit 34.

The transmitters 30, firing the voice communication, of course also actand are designed, for voice use, to act as receivers. The connection forvoice in two directions between the transmitters 30 and voice controlcircuit 36 may be easily provided in accord with circuitry well known tothose skilled in the art.

lt will be appreciated that the lines between blocks in FIG. 1 do notnecessarily represent single wires, and the number of leads willrepresent those conventionally required between known circuits togetherwith those lines herein discussed.

It should be noted that where the number of subscribers associated witha single transmitter 30 is large enough, data set 183 may be directlyconnected to the data set 26 without passing through the conventionaltelephone system and without using the automatic calling unit. Howevereven where this is done, the automatic calling unit and the conventionaltelephone system will still be used for connection of the data set 168to other transmitters and/or other computers.

It should also be noted that, although not a preferred mode ofoperation, the automatic calling unit 16A may not only be used toachieve the connection to a data set 26 or 126 or a computer but mayalso be used to supply the subscriber characterizing digital informationfor the relevant transmitter or computer. in this alternative the dataset receiving this information will be arranged to accept and processthe digital information in the form received from the automatic callingunit.

It may also be of value to discuss an example of digital diallingdesignations used with the system. This is not intended to limit thescope of the invention but to assist in understanding the specificembodiment.

A paging access number will usually comprise a set of seven digits whichmay be appended to digital prefixes such as direct dialling or areacodes.

The subset of the paging number set of digits will have a number ofdigits related to the number of paging subscribers whose records arestored at a computer. With 10 to subscribers a subset comprising thelast two digits will be sufficient to identify all subscribers. Withl0O-l000 and with lOOO-lOOOO subscribers the subset must comprise thelast three or last four digits respectively. With such subsets thecomputer will be connected to the system to be reached by normaltelephone switching connections on the dialling of the subset comprisingthe remaining and preceding digits in the seven-figure number.

Thus if a subscriber has a paging access number 442-1967 and there are9000 paging subscribers at the same computer 116 then the subset 1967'will identify the paging subscriber at the computer. The computer willthen be connected to be reached in the telephone system by dialling thepreceding subset 442.

When the computer directs the automatic calling unit to call a data set26 or R26 or another computer 16, the number dialled will be theordinary telephone number for such data set 26 or 126 or a computer witharea codes appended where required.

The information supplied to the data sets has been described. Theinformation supplied to the other computer will be a subset of digits toreach the other computer and a subset of digits to identify at thesecond computer the subscriber originally paged at the first computer.It is noted that the following subset digits identifying the subscriberat the second computer may differ in number and value to thoseidentifying the same subscriber at the first computer, as long as eachcomputer, in response to the relevant subset is programmed, in responseto the receipt thereof, to cause its transmitter to broadcast on thefrequency to which the subscribers paging receiver is tuned.

ln the description to follow several relays and their contacts aredescribed. A uniform method of designation is here used. The relay isdesignated by R and a digit. lts contacts are in FlG. 2 is shown thedetail of the trunk circuit in accord I with the invention.

Tip line 100A from toll or local switching office 12 or is connectedacross the primary of transformer 102 to ring lead 104A. The primaryconsists of coils 106A in series with condenser 108A and coil 110A, asshown. Ground supply is connected through one coil of high impedancerelay Rl through normally closed contacts R5-2 and coil 106A to the line100A. A 48v. supply is connected through the other coil of relay R1 andnormally closed contacts RS-l through coil 110A to line 104A. Normallyopen contacts R5-4 and R5-3 are connected to reverse the aboveconnections between ground and thc 48v. supply on the one hand and lines100A and 104A on the other hand when R5-3 and R5-4 are closed and thecontacts RS-l and R5-2 are opened.

The output winding of transformer 102A connects tip and ring lines 124Aand 122A comprises coils 114A and 116A connected in series with and oneach side of condenser 118A. Connected in parallel with condenser 118Ais a polarized relay R5. Lines 124A and 122A are connected to a call notaccepted tone generator 126A through the normally open contacts R2-1 andR2-2 respectively, of a relay R2. Lines 124A and 122A are connected to acall accepted tone generator 128A through the normally open contactsR3-1 and R3-2 respectively of a relay R3.

Lines 124A and 122A are connected to input terminals of a frequencydiscriminator and decoder circuit 126B through the normally closedcontacts R4-l and R4-2 of a relay R4. Lines 124A and 122A areconnectable respectively through the normally open contacts R4-3 andR4-4 of the relay R4 and then through normally open contacts R and R1-6respectively to form the tip and ring inputs to the local switchingoffice 10 along line 24.

The frequency discriminator decoder circuit 1268 may take any form toaccept at its input tones or frequencies transmitted representative ofdigits and to provide DC signals along lines 130A for the computerrepresentative of such digits.

A ground is connected to the computer through normally open contactsR1-7.

Line 132A from the computer 16 is connected to the gate of an SCR138.Line 139 is connected from the anode of SCR138 through the nomiallyclosed contacts R4-S of relay R4, in series through the normally opencontacts R1-6 of relay R1 to ground. The cathode of SCR138 is connectedto 48v. through relay R3.

Line 134A from the computer 16 is connected to the gate of a SCR140 andthe anode of SCR140 is connected to ground through the normally opencontacts Rl-o. The cathode of SCR140 is connected to a 48 v. supplythrough relay R2.

Line 136A from the computer 16 is connected to the gate of an SCR142 andthe anode of SCR142 is connected to ground through the normally opencontacts R1-6A. The cathode of SCR142 is connected to a -48v. supplythrough relay R4.

ln operation when a paging access call is made to computer 16, whicheverof the toll or local office 12 or 10 is making the call completes, withnormal telephone switching, a short across lines 100A and 104Aenergizing relay R1. This closes contacts R1-7 on lead 150. Lead 150 isconnected in the computer on the closure of contacts R1-7 to indicate tothe computer that a call is present and to be ready to receive thedigits arriving on leads 100A and 104A. The toll or local switchingoffice now provides the digital subset from the telephone access numberto identify the subscriber at the computer. The mode of transmitting thedigits may, in accord with conventional modes of signalling, be by pulseor tones. lf pulse, these will appear on the trunk circuit asintermittent openings of relay R1. This will result in correspondingopenings of contacts R1-7 whereby the corresponding pluses are suppliedto the computer which thereupon may assemble the pulses and digits toform the required number. if the manner of signalling the requirednumber from the switching office on the loads A and 104A is a series offrequencies (such, for example, as in multifrequency pulsing) these passthrough transformer 102A and across contacts R4-2 and R4-l to frequencydiscriminator and decoder circuit 1268 which acts to provide thecomputer 16 along lines A with information as to the frequencies andhence the digits received. When the digital information has beensupplied (whatever the method of sending the digital information) thecomputer is designed to compare these digits with subsets in storage tosee if a corresponding subset of digits is in storage. if not, thecomputer supplies a gating pulse along line 134A to trigger SCR(contacts R1- 6 being closed) and the resulting energization of relay R2closes contacts R2-1 and R2-2 applying a call not accepted tone throughleads 122A and 124A to the leads 100A and 104A which may be noted by thecalling party. If the computer finds a corresponding set of digits instorage it energizes lead 132A to supply a gating pulse to trigger theSCR138 energizing relay R3, closing contacts REM and R3-2 and applying acall accepted tone to lines 100A and 102A through leads 122A and 124A.It will be understood that the call accepted and call not accepted toneswill be audibly different Whether the call accepted or call not acceptedtone is sent, the caller may now disconnect, unless a voice connectionis required. If the caller hangs up, the short across leads 100A and104A is broken, R1 is deenergized and all R1 contacts return to theirnormal position. If a voice connection is required, the calling partymaintains the connection. The computer on locating the corresponding setof digits in its storage will have a record that the subscribercorresponding to these digits requires voice connection and the computerwill be programmed to energize lead 136A, turning on SCR142, energizingrelay R4, R4-l, R4-2 and R4-5 now open disconnecting the frequencydiscriminator and decoder circuit 1268 and turning off SCR138. ContactsR4-3 and R44 close, and Rl-S and R1-6 are already closed, making theconnection between the toll deenergized local switching office 10 andthe line 20 back to local switching office 10 and bypassing computer 16and blocks 18A and 188 whose purpose has been served. It will be notedthat if a second computer, called by the first computer is involved,similar circuitry will bypass said second computer for the voiceconnection. On connection of lines 122 and 124 to the switching ofi'icethrough line 20, a DC voltage is in accord with conventional practice,applied by office 10 to line 124A and 122A to energize polarized relayR5. This closes contacts R5-3 and RS-4 and opens contacts R5-1 and R5-2to reverse the polarity of voltage applied by the -48v. supply to lines100A and 104A. This is not directly related to the purposes of thisinvention, but provides the actuation to calculate the toll charge forthe voice call in a charge situation.

When the call is completed, the calling party disconnects and thiscauses release of relay Rl opening contacts R1,-6A and disconnectingSCR142. When SCR142 turns off relay R4 is deenergized and R43 and R44open, disconnecting lines 122A and 124A from line 24 while R4-l and R4-2and R4-5 close, reconnecting lines 124A and 122A with the frequencydiscriminator and decoder circuit 1268 and connecting the anode ofSCR138 to contacts R1-6A.

In FIG. 3 is shown the voice control circuit which provides theinterface or impedance and power matching during a voice connectionbetween local switching office 10, and transmitter control circuit 34.This must be considered as optional equipment since as will be obvious,a paging system may be operated in accord with the invention without thevoice communication feature. Referring back to FIG. 2, shortly, if thevoice communication feature is omitted, then the voice frequencyelements R5, R4, their contacts and SCRMZ would not be used.

Relating to FIG. 3, it will be seen that lines and 152 represent the tipand ring leads from switching office 10 to data set 26 and transmittercontrol circuit 34. Leads 150 and 152 are normally connected to the tipand ring leads 154 and 156 respectively through normally closed contactsRtS-l. and

R6-2 respectively of relay R6. Leads 150 and 152 are connectable tolines 156 and 160 to control circuit 34 through the normally opencontacts R63 and R64 respectively, of relay R6. Line 156 is connected inseries through one primary winding 162 of transformer 168, condenser164, and the other primary winding 166 to line 160. A 48v. source isconnected through one winding of high impedance relay R7 and in seriesthrough winding 166 to line 160. A ground is connected through the otherwinding of high impedance relay R7 and, in series, through primarywinding 162 to line 156.

A line 170 from data set 26 is connected to 48v. through a relay R6. Thejunction between line 170 and relay R6 is connected to ground throughnormally open contacts R66, R94 and R7-1 in series. The secondary oftransformer 166 comprises winding 1'72, condenser 174 and winding 176 inseries between tip and ring lines 1711 and 160 for connection to thetransmitter control circuit 34. Connected in parallel with con denser174 is a cored coil 176 for impedance matching of the connected parts ofcircuit 34 with the connected parts of circuit 10. Llnes'176 and 180were respectively connectable through normally open contacts R6-5 andR66 to transmitter control circuit 34. A 48v. source is connectedthrough relay R9 and normally open contacts R6-7 in series to thetransmitter control circuit.

The operation of the circuitry of FIG. 3 will now be discussed. When notin use, the circuitry is in the state illustrated in the drawings. Whenvoice communication is required, with a paging call, the computer sendsthe required signal to data set 26 and data set 26 in accord with itsdesign and means well known to those skilled in the art, applies aground to line 1711 energizing relay R6. Contacts R641 and R6- 2 opendisconnecting the data set. Contacts R6-3, 4, 5 and 6 close providing analternating current connection between switching ofiice and transmittercontrol circuit 34. Contacts R67 and R66 also close. Switching office 10supplies a short between lines 150 and 152 so that R7 is energized andcontacts R7-1 close. The presence of the called party on the linecauses, in accord with well-known design techniques the application of aground at transmitter control circuit 34 in series with relay R9 andcontacts R66 (now closed) to energize relay R9. Contacts R9-1 thereforeclose. With contacts R6-8,

R9-1 and R7-1 closed R6 is locked in energized state. Lead 170 isdeenergized at data set 26 conditional on the opening of contacts R6-1and R6-2 but the deenergization of lead 170 is timed to talte placeafter the closing of contacts R66, R94 and R7-ll. The voice conversationnow takes place bypassing data set 26 and code converter circuit 28. Aswill be appreciated transmitter 30 is provided, in accord withwellltnown techniques with means for applying voice communication alonglines 176 and 160 to the transmitted signal and for providing voicesignals to these lines from a received signal. The conversation may beterminated by the calling party hanging up. This removes the shortbetween lines 150 and 152 and deenergizes relay R'l, opening contactsR7-l, deenergizing relay R6, causing all the R6 contacts to assume theirstates shown in F16. 3 and disconnecting the voice control circuit fromswitching office 10 and transmitter control circuit 34 and reconnectingthe local switching ofiice 10 to data set 26. The relay R9 will bedeenergized and contactsR'lb-l will open due to the opening of contactsR6-7.

When the called party hangs up, ground will be removed from the lead tocontacts R67. 1f the called party hangs up first, therefore, relay R9 isdeenergized, opening contacts R9- 1 and'deenergizing relay R6 with theoperation of the R6 contacts discussed above.

subscriber are sequentially signalled by the selected tones from thetone generator to the transmitter. Although this could be done by 10separate tones, or various pair combinations of 7 tones (as in TOUCHTONE dialling) it is preferred to provide 10 tones on lines T1 to T9from tone generator 32 and to respectively represent the digits 0--9 bycausing the closing of three RAx-1, RBy-l, RCz-l to select the correctone of the 10 lines. In actual fact it is preferred to provide threelines and tones for each digit with the three tones for a digit beingmore similar to each other than to other tones. Thus 30 alternatives areprovided. However 10 lines only are shown for brevity. There aretherefore 10 pair of lines T selectively connectable to tip and ringleads 181 and 1820f the circuit 34 by 10 different combinations of an A,B and C relay contact. A line 1 from transmitter control circuit 34 isconnected through normally open contacts RCO-1, RBO-l and RAG-1 toground. A lead 166 from transmitter control circuit 34 is connectedthrough relay R10 to 48v. A lead 168 from the transmitter controlcircuit 34 is connected to 48v. through relay R11. The data set 26provides line 190 connected to ground through normally open contactsRIO-1 and line 192 through normally open contacts R11-1. In accord withthe normal design of the data sets 16 and 26 data set 26 is designed tooperate a 3 in 14 binary code providing one on' or grounded state in:one of five lines A0 to A4, one of five lines B0 to B4 and one of fourlines Co to C3 to represent a digit or other information. Each line isconnected to 48v. through a relay RA, RB or a RC but of these relaysonly RAO, R or RCO are shown for brevity. The combination RAO, R and RCOwhen energized connect line 184 to ground. The 10 combinations of ABCcontacts selectively close a line pair TO to T9 to indicate digits arenot shown individually but are represented by the triplet RAx-1, RBy-1and RCz-l.

in operation, when the data set 26 is directed to supply paging data tothe transmitter control circuit it grounds a combination of A, B and Clines which is not to be used for digital representation. Here thiscombination has been selected as lines A0, B0, C0. Accordingly relaysRAO, RBO and RCO are energized and the corresponding 1 contacts closeapplying a ground to lead 164 to transmitter control circuit 34. Thetransmitter control circuit 34 is designed to be turned on and inverification of this to apply a ground to line 186, energizing relay R10and closing contacts R10-1. This is used to ground line and indicate tothe data set 26 that the subscriber identifying digital information maybe sent. This is sent sequentially at a rate suitable to the data set26, the transmitter control circuit 34 and the subscribers receiver,say, information as to a digit for 0.25 seconds and a 0.1 secondinterval between digits. Thus the required number of digits is sent,with for each digit, a combination of RA, RB and RC, relays beingenergized and a different line pair and tone resultantly connected tolines 100-182. With the digital information the transmitter transmitsthe signals corresponding to the subscriber indicating digits.

It will be noted that for a single connection of data set 26 to controlcircuit 34 a number of sets of paging subscriber digits may be sentwithout the necessity of turning off and on the transmitter each time.When transmission to control circuit 34 is completed the transmitter istold by a special combination of A B & C relay contacts (not shown) ofthis fact and ground is removed from line 166 and R10-1 opens.

If during connection of the transmitter or during digit transmission, atrouble condition appears at the transmitter, the transmitter will applya ground to line 188, energizing relay R11 and contacts R11-1 are closedconnecting line 192 to ground. This may by well-known techniques, berelayed through data set 26 to the computer 16 to cause it to print atrouble report.

The number of digits supplied to transmitter control circuit 34 fromdata set 26 and the computer depends on the number of paging subscribersusing the transmitter. If the number is between 100 1000 three decimaldigits will be transmitted, 1000 and 100000 four decimal digits 10000and 100000 five digits.

We claim:

I. For use with a telephone system, having connected thereto a pluralityof transmitter controls said controls each being connectable to a linein the system carrying a combination of subscriber dialed-type digitsfor establishing through the system, the connection thereto, where thecombination of digits and the connection is different for differentcontrols, a radio transmitter connected to each of said transmitter controls for control thereby to vary the signals emitted by saidtransmitters, where each of said transmitters is designed to reachreceivers in its own paging area, where said transmitter controls aredesigned to respond to signals received along a connection from saidsystem to cause said transmitter to provide transmitted signals uniqueto a paging receiver in its paging area; and means connected to bereached through said telephone system programmed and designed, onreceipt of information from said telephone system as to the values of asubset of digits forming part of one of a set of telephone numbers, toprovide information as to the transmitter controls corresponding topaging areas associated with said one telephone number from said set andalso information identifying said received subset;

means responsive to the placing on a telephone line of said system, ofdialed digits representing a telephone number forming one of said set,for connecting said line through said system to said programmed meansand for providing thereto information as to the value of the digitsubset forming part of said number; and

means responsive to the information provided by said programmed means asto paging areas, for achieving connection through the system to thetransmitter controls corresponding to transmitters for paging areasassociated with said represented telephone number; and

means responsive to the information as to the value of said receivedsubset to supply control signals characteristic thereof to saidcorresponding transmitter controls.

2. in a telephone system combined with means for paging telephonesubscribers using radio transmitters effective with a localized areadesigned to provide, responsive to coded information, signalscharacteristic of said coded information and wherein paging receiversare provided for selective actuation by selective actuation by selectivevariants of said signals, such transmitters being associated withdesignated areas and being accessible through the telephone system;

means for storing, in association with each of a subset of digitsinformation as to the telephone numbers of predetermined ones of saidtransmitters;

means for supplying to said storage means, the digital encoded forrn ofa corresponding subset of digits forming part of a telephone number;

means associated with said storage means, responsive to receipt of suchsubset corresponding to a stored subset for signalling on the system toachieve connection of said storage means with each of the predeterminedtransmitters associate with said stored subset;

means associated with said storage means for providing to each saidconnected transmitter control signals to provide predetermined selectivevariants of said signals.

3. in a telephone paging system for use with transmitters effectivewithin a localized area, controllable to provide, responsive to codedinfonnation characteristic of a paging subscriber, a radio signal forselective reception by, and actuation of, the subscriber's pagingreceiver, a telephone number associated with a paging subscriber, atelephone number for achieving through said system, connection to atransmitter control for controlling each transmitter; differenttransmitter controls having different telephone numbers;

means for storing, in association with digits identifying saidassociated telephone numbers, information identifying the telephonenumbers of transmitter controls in predetermined localized areascharacteristic of the associated telephone number;

means for supplying to said storage means, digits identifying thetelephone number associated with said subscriber;

means responsive to such supply for establishing connections in thesystem between said storage means and the telephone controls oftransmitter controls for the areas characteristic of the associatedtelephone number;

5 means for supplying, along said last-mentioned connections,

coded information for causing said transmitters to transmit signals toselectively actuate the receiver of the subscriber having suchidentified telephone number.

4. Means for operating a telephone subscriber paging system inconjunction with a telephone system comprising:

storage means accessible through the telephone system having, for eachofa plurality of series ofdigits forming a succeeding part of atelephone number, information identifying the dialed digits required toestablish connections through the system to controllable transmitters;where the dialed digits and the established connections are differentfor different transmitters;

said storage means being identified with a preceding series of digits,means for connecting a line in said system to said storage means whensaid preceding series is signaled on said lines;

means actuable on such last-mentioned connection of said line to comparea succeeding series of digits from said line with groups of digits insaid storage means to determine whether or not said succeeding seriescorresponds to a stored group;

means responsive to ascertainment of said correspondence to dialpredetermined transmitter controls in said system and to provide to saidtransmitters, control information characteristic of said succeedingseries of digits;

said transmitter controls being designed, in response to said controlinformation to cause said transmitter to transmit signals characteristicof said control information.

5. For operating a telephone paging system in combination with aconventional telephone system have a plurality of transmitters designedto transmit paging signals in a plurality of paging areas, whereindifferent paging subscribers are paged by different paging signals,controls for said transmitters being connected to be reached throughsaid telephone system by signaling on said system of digits of thesubscriber dialed-type; different controls having different telephonenumbers;

said controls being designed in response to signals received over saidsystem, for actuating said transmitters and to be controlled to selectthe paging signalstransitted thereby;

storage means responsive to the dialing on said system of a singlepaging access number for providing the designation of one or moretransmitters which will broadcast a paging signal;

means responsive to said last-mentioned determination to achieveconnection on said system from said responsive means to control meansfor said designated transmitters, and to supply signals to determine thepaging signals transmitted from said transmitters.

6. A system combining radio paging service with a conventional telephonesystem including:

paging radio transmitters;

each paging transmitter being designed and constructed to radiate radiosignals to a selected paging area; and to transmit signals adapted toselectively energize paging receivers for said signals; controls forsaid paging radio transmitters; each control for a paging radiotransmitter being connected and designed to control at least one pagingradio transmitter in accord with signals received by said controls;

each control being connected to said conventional telephone system to bereached by conventional connections therethrough;

different controls being reached by different connections;

wherein telephone subscribers to the radio paging system may designatedifferent paging areas and/or different groups of paging areas;

information storage means, storing information adapted to identifypaging subscribers and the paging areas which they have selected;

said information storage means being designed and constructed on receiptof digital information, to determine whether said digital informationcorresponds to stored information identifying a paging subscriber and,in the event of such correspondence, to provide signals indicative ofthe paging areas selected by the identified subscriber and signalsidentifying the subscriber;

means for coupling said information storage means to said. conventionaltelephone system designed and connected so that signals of thesubscriber dialed-type on a line of said conventional system canestablish a first connection along said conventional telephone system tosaid storage means and can provide potential subscriber identifyinginformation'to said storage means;

means for coupling said infonnation storage means to said conventionaltelephone system designed and connected so that: signals provided bysaid storage means determined by the paging areas selected by theidentified sub scriber establish second connections through saidconventional system to each of the controls for transmitterscorresponding to said selected areas to that said subscriber identifyingsignals provided by said storage are transmitted to such last-mentionedcontrols over said second connection;

said controls being connected to the conventional system and designedand constructed to control said transmitters in accord with saidsubscriber identifying signals received over said second connection.

7. A system combining a radio paging service with a conventionaltelephone system including:

paging radio transmitters;

each paging transmitter being designed and constructed to radiate radiosignals to a selected paging area; and to transmit signals adapted toselectively energize paging receivers for said signals;

controls for said paging radio transmitters;

each control for a paging radio transmitter being connected and designedto control at least one paging radio trans mitter in accord with signalsreceived by said controls;

each control being connected to said conventional telephone system to bereached by conventional connections therethrough;

different ones of said controls being connected to the conventionalsystem to be reached by different connections established byrespectively different digital signals of the subscriber dialed-type;

wherein telephone subscribers to the radio paging system may designatedifi'erent paging areas and a different number of paging areas;

information storage means, storing information adapted to identifypaging subscribers and the paging areas which they have selected;

said information storage means being designed and constructed, onreceipt of digital information, to determine whether such digitalinformation corresponds to stored information identifying a pagingsubscriber, and, in the event of such correspondence, to provide signalsindicative of the paging areas selected by the identified subscriber andsignals identifying the subscriber;

means for coupling said information storage means to said conventionaltelephone system, designed and connected so that signals of thesubscriber dialed-type on a line of said conventional system canestablish a first connection along said conventional telephone system tosaid storage means and can provide potential subscriber identifyinginformation to said storage means;

means for coupling said information storage means to said conventionaltelephone system designed and connected so that: signals determined bythe paging areas selected by the identified subscriber provide a digitalsignal to establish respective second connections through the telephonesystem to each of the controls for transmitters corresponding to thepaging areas selected by the subscriber, and so that said subscriberidentif ing signals rovided by said storage means are transmlt ed tosuch astmentioned controls over said second connection.

1. For use with a telephone system, having connected thereto a pluralityof transmitter controls said controls each being connectable to a linein the system carrying a combination of subscriber dialed-type digitsfor establishing through the system, the connection thereto, where thecombination of digits and the connection is different for differentcontrols, a radio transmitter connected to each of said transmittercontrols for control thereby to vary the signals emitted by saidtransmitters, where each of said transmitters is designed to reachreceivers in its own paging area, where said transmitter controls aredesigned to respond to signals received along a connection from saidsystem to cause said transmitter to provide transmitted signals uniqueto a paging receiver in its paging area; and means connected to bereached through said telephone system programmed and designed, onreceipt of information from said telephone system as to the values of asubset of digits forming part of one of a set of telephone numbers, toprovide information as to the transmitter controls corresponding topaging areas associated with said one telephone number from said set andalso information identifying said received subset; means responsive tothe placing on a telephone line of said system, of dialed digitsrepresenting a telephone number forming one of said set, for connectingsaid line through said system to said programmed means and for providingthereto information as to the value of the digit subset forming part ofsaid number; and means responsive to the information provided by saidprogrammed means as to paging areas, for achieving connection throughthe system to the transmitter controls corresponding to transmitters forpaging areas associated with said represented telephone number; andmeans responsive to the information as to the value of said receivedsubset to supply control signals characteristic thereof to saidcorresponding transmitter controls.
 2. In a telephone system combinedwith means for paging telephone subscribers using radio transmitterseffective with a localized area designed to provide, responsive to codedinformation, signals characteristic of said coded information andwherein paging receivers are provided for selective actuation byselective actuation by selective variants of said signals, suchtransmitters being associated with designated areas and being accessiblethrough the telephone system; means for storing, in association witheach of a subset of digits information as to the telephone numbers ofpredetermined ones of said transmitters; means for supplying to saidstorage means, the digital encoded form of a corresponding subset ofdigits forming part of a telephone number; means associated with saidstorage means, responsive to receipt of such subset corresponding to astored subset for signalling on the system to achieve connection of saidstorage means with each of the predetermined transmitters associate withsaid stored subset; means associated with said storage means forproviding to each said connected transmitter control signals to providepredetermined selective variants of said signals.
 3. In a telephonepaging system for uSe with transmitters effective within a localizedarea, controllable to provide, responsive to coded informationcharacteristic of a paging subscriber, a radio signal for selectivereception by, and actuation of, the subscriber''s paging receiver, atelephone number associated with a paging subscriber, a telephone numberfor achieving through said system, connection to a transmitter controlfor controlling each transmitter; different transmitter controls havingdifferent telephone numbers; means for storing, in association withdigits identifying said associated telephone numbers, informationidentifying the telephone numbers of transmitter controls inpredetermined localized areas characteristic of the associated telephonenumber; means for supplying to said storage means, digits identifyingthe telephone number associated with said subscriber; means responsiveto such supply for establishing connections in the system between saidstorage means and the telephone controls of transmitter controls for theareas characteristic of the associated telephone number; means forsupplying, along said last-mentioned connections, coded information forcausing said transmitters to transmit signals to selectively actuate thereceiver of the subscriber having such identified telephone number. 4.Means for operating a telephone subscriber paging system in conjunctionwith a telephone system comprising: storage means accessible through thetelephone system having, for each of a plurality of series of digitsforming a succeeding part of a telephone number, information identifyingthe dialed digits required to establish connections through the systemto controllable transmitters; where the dialed digits and theestablished connections are different for different transmitters; saidstorage means being identified with a preceding series of digits, meansfor connecting a line in said system to said storage means when saidpreceding series is signaled on said lines; means actuable on suchlast-mentioned connection of said line to compare a succeeding series ofdigits from said line with groups of digits in said storage means todetermine whether or not said succeeding series corresponds to a storedgroup; means responsive to ascertainment of said correspondence to dialpredetermined transmitter controls in said system and to provide to saidtransmitters, control information characteristic of said succeedingseries of digits; said transmitter controls being designed, in responseto said control information to cause said transmitter to transmitsignals characteristic of said control information.
 5. For operating atelephone paging system in combination with a conventional telephonesystem have a plurality of transmitters designed to transmit pagingsignals in a plurality of paging areas, wherein different pagingsubscribers are paged by different paging signals, controls for saidtransmitters being connected to be reached through said telephone systemby signaling on said system of digits of the subscriber dialed-type;different controls having different telephone numbers; said controlsbeing designed in response to signals received over said system, foractuating said transmitters and to be controlled to select the pagingsignals transitted thereby; storage means responsive to the dialing onsaid system of a single paging access number for providing thedesignation of one or more transmitters which will broadcast a pagingsignal; means responsive to said last-mentioned determination to achieveconnection on said system from said responsive means to control meansfor said designated transmitters, and to supply signals to determine thepaging signals transmitted from said transmitters.
 6. A system combiningradio paging service with a conventional telephone system including:paging radio transmitters; each paging transmitter being designed andconstructed to radiate radio signals to a selected paging area; and totransmit signalS adapted to selectively energize paging receivers forsaid signals; controls for said paging radio transmitters; each controlfor a paging radio transmitter being connected and designed to controlat least one paging radio transmitter in accord with signals received bysaid controls; each control being connected to said conventionaltelephone system to be reached by conventional connections therethrough;different controls being reached by different connections; whereintelephone subscribers to the radio paging system may designate differentpaging areas and/or different groups of paging areas; informationstorage means, storing information adapted to identify pagingsubscribers and the paging areas which they have selected; saidinformation storage means being designed and constructed on receipt ofdigital information, to determine whether said digital informationcorresponds to stored information identifying a paging subscriber and,in the event of such correspondence, to provide signals indicative ofthe paging areas selected by the identified subscriber and signalsidentifying the subscriber; means for coupling said information storagemeans to said conventional telephone system designed and connected sothat signals of the subscriber dialed-type on a line of saidconventional system can establish a first connection along saidconventional telephone system to said storage means and can providepotential subscriber identifying information to said storage means;means for coupling said information storage means to said conventionaltelephone system designed and connected so that: signals provided bysaid storage means determined by the paging areas selected by theidentified subscriber establish second connections through saidconventional system to each of the controls for transmitterscorresponding to said selected areas to that said subscriber identifyingsignals provided by said storage are transmitted to such last-mentionedcontrols over said second connection; said controls being connected tothe conventional system and designed and constructed to control saidtransmitters in accord with said subscriber identifying signals receivedover said second connection.
 7. A system combining a radio pagingservice with a conventional telephone system including: paging radiotransmitters; each paging transmitter being designed and constructed toradiate radio signals to a selected paging area; and to transmit signalsadapted to selectively energize paging receivers for said signals;controls for said paging radio transmitters; each control for a pagingradio transmitter being connected and designed to control at least onepaging radio transmitter in accord with signals received by saidcontrols; each control being connected to said conventional telephonesystem to be reached by conventional connections therethrough; differentones of said controls being connected to the conventional system to bereached by different connections established by respectively differentdigital signals of the subscriber dialed-type; wherein telephonesubscribers to the radio paging system may designate different pagingareas and a different number of paging areas; information storage means,storing information adapted to identify paging subscribers and thepaging areas which they have selected; said information storage meansbeing designed and constructed, on receipt of digital information, todetermine whether such digital information corresponds to storedinformation identifying a paging subscriber, and, in the event of suchcorrespondence, to provide signals indicative of the paging areasselected by the identified subscriber and signals identifying thesubscriber; means for coupling said information storage means to saidconventional telephone system, designed and connected so that signals ofthe subscriber dialed-type on a line of said conventional system canestablish a first connection along said conventional telephone system tosaid storage means and can provide potential subscriber identifyinginformation to said storage means; means for coupling said informationstorage means to said conventional telephone system designed andconnected so that: signals determined by the paging areas selected bythe identified subscriber provide a digital signal to establishrespective second connections through the telephone system to each ofthe controls for transmitters corresponding to the paging areas selectedby the subscriber, and so that said subscriber identifying signalsprovided by said storage means are transmitted to such last-mentionedcontrols over said second connection.